CVE-2026-89534 (GCVE-0-2026-89534)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-21 12:47
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
svcrdma: Clear sc_cm_id when ADDR_CHANGE replacement fails
When svc_rdma_listen_handler() handles RDMA_CM_EVENT_ADDR_CHANGE,
it creates a replacement listener cm_id and returns 1, telling
the CM core to destroy the old one. If the replacement allocation
fails, sc_cm_id still points at the old cm_id that the CM core is
about to destroy. Any subsequent dereference of sc_cm_id --
such as svc_rdma_detach()'s rdma_disconnect() call -- is a
use-after-free.
NULL sc_cm_id on the failure path and guard svc_rdma_detach()'s
rdma_disconnect() call against NULL so that the listener can
be torn down safely when the server shuts down.
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: d1b586e75ec619dde1af47e21a41a6b1b51874c2 Version: d1b586e75ec619dde1af47e21a41a6b1b51874c2 Version: d1b586e75ec619dde1af47e21a41a6b1b51874c2 Version: d1b586e75ec619dde1af47e21a41a6b1b51874c2 Version: 5cd069ad1cf7fb46af31f0dbe2850868335f5272 Version: 6.6.160 ≤ |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/sunrpc/xprtrdma/svc_rdma_transport.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"versionType": "git"
},
{
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"versionType": "git"
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{
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"versionType": "git"
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{
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"version": "d1b586e75ec619dde1af47e21a41a6b1b51874c2",
"versionType": "git"
},
{
"status": "affected",
"version": "5cd069ad1cf7fb46af31f0dbe2850868335f5272",
"versionType": "git"
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{
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"status": "affected",
"version": "6.6.160",
"versionType": "semver"
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]
},
{
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"product": "Linux",
"programFiles": [
"net/sunrpc/xprtrdma/svc_rdma_transport.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"lessThan": "6.11",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.114",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.57",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.6.160",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Clear sc_cm_id when ADDR_CHANGE replacement fails\n\nWhen svc_rdma_listen_handler() handles RDMA_CM_EVENT_ADDR_CHANGE,\nit creates a replacement listener cm_id and returns 1, telling\nthe CM core to destroy the old one. If the replacement allocation\nfails, sc_cm_id still points at the old cm_id that the CM core is\nabout to destroy. Any subsequent dereference of sc_cm_id --\nsuch as svc_rdma_detach()\u0027s rdma_disconnect() call -- is a\nuse-after-free.\n\nNULL sc_cm_id on the failure path and guard svc_rdma_detach()\u0027s\nrdma_disconnect() call against NULL so that the listener can\nbe torn down safely when the server shuts down."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - svcrdma is the in-kernel NFS/RDMA server listen path; RDMA_CM_EVENT_ADDR_CHANGE is raised only from cma_netdev_callback on NETDEV_BONDING_FAILOVER when the bound bond MAC changes, so an attacker on the RoCE/IB storage fabric inducing active-backup failover reaches the bug, matching ADDR_CHANGE scoring for RPC-over-RDMA.\nAC:L - svc_rdma_create_listen_id() binds the replacement while the old listen cm_id still owns the port, so rdma_bind_addr() fails deterministically with EADDRINUSE/EADDRNOTAVAIL; the handler still returns 1 and the CM core frees that id, leaving a dangling sc_cm_id the attacker can arm by inducing failover.\nPR:N - The NFS/RDMA listener is already running as a network service; bonding failover and RDMA CM ADDR_CHANGE delivery perform no RPC, NFS export, or other authentication, so an adjacent fabric attacker needs no account or capability on the victim host.\nUI:N - Exploitation uses attacker-induced link failover plus subsequent listener teardown (nfsd restart/shutdown, the normal operational response once the listen endpoint is dead); no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - The use-after-free corrupts the host kernel rdma_cm_id/rdma_id_private object used by nfsd\u0027s RDMA transport in the same kernel security authority and is not a VM, IOMMU, or sandbox escape.\nC:H - After the CM core destroys the listen id, sc_cm_id is a dangling pointer to a freed rdma_cm_id with an event_handler; later rdma_disconnect()/rdma_destroy_id() in svc_rdma_detach/free is a kernel heap UAF that enables arbitrary disclosure via controlled reuse.\nI:H - svc_rdma_detach() calls rdma_disconnect() on the freed cm_id and svc_rdma_free() may rdma_destroy_id() it again, yielding UAF writes, double-free, and function-pointer hijack of event_handler, so integrity impact is High per UAF guidance.\nA:H - Use-after-free of the listen rdma_cm_id during detach/free causes a kernel oops or panic even when not fully exploited, so availability impact is High."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-21T12:47:44.767Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2a68aeb2de8ad0fef9c50e73a50622a35c6af1a8"
},
{
"url": "https://git.kernel.org/stable/c/65f0f82f20334e76acaf29087a59af7b3b9699ed"
},
{
"url": "https://git.kernel.org/stable/c/673e358ab7c11f8cec223c6a36a793056a67facd"
},
{
"url": "https://git.kernel.org/stable/c/01500306e1d50de7ca7a2cdcdfa28ac0523eb747"
}
],
"title": "svcrdma: Clear sc_cm_id when ADDR_CHANGE replacement fails",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-89534",
"datePublished": "2026-09-11T19:44:12.987Z",
"dateReserved": "2026-09-11T19:38:34.720Z",
"dateUpdated": "2026-10-21T12:47:44.767Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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